Machine for bending metal bars and the like



K. G. M. RUNBACK. MACHINE FOR BENDING METAL BARS AND THE LIKE. APPLICATION FILED JA N. 5. 1920.

1,885,278. Patented Ju1y19, 1921.

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Kur GusTav Magws Runlodck QMWGWMMQ K. e. M. RUNBACK. MACHINE FOR BENDING METAL BARS AND THE LIKE.

APPLICATION FILED JAN-5,1920.

Patented July 19, 1921.

3 SHEETS-SHEET 2- five/for: 8 K usTav MognusRunkdck K. G. M. RUNBACK. MACHINE FORVBENDING METAL BARS AND THE LIKE. APPLICATION FILED JAN. 5. 1920.

' 1,385,278, Patented July 19, 1921.

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UNITED STATES PATENT OFFICE.

KARL GUSTAV MAGNUS RUNBACK, OF STOCKHOLM, SWEDEN.

Specification of Letters Patent.

rammed July 19, 1921.

Application filed January 5, 1920. Serial No. 349,485.

To all whom it may concern:

Be it known that I, KARL GUSTAV MAGNUS RUNnz'ioK, a subject'of the King of Sweden, residing at Stockholm, in the Kingdom of Sweden, have invented a new and useful Improvement in Machines for Bending Metal Bars and the like, of which the following is a specification.

The present invention relates to a machine for bending metal bars, rods, and the like of the type which is provided with two stationary supports or stops for the bar and a third rotatable support or stop, preferably rotatable around one of the stationary supports, said third support obtaining from a driving device a periodical rcciprocatory oscillatory movement with an interval or dwell after every period of the movement. The invention is principally characterized by this that for transmitting motion to the rotatable support, said support is connected with a rotatable disk around the periphery of which is placed a rope or the like which is connected to a rotary crank or the like driven by the driving device. The machine is suitably provided with an adjustment device so constructed that the length of the interval or dwell, or the length of the movement of the rotatable support may be regulated, and said adjustment device is )referably so arranged as to render possi lo a continuous adjustment, so that the adjustment is thus not limited to any particular positions of adjustment.

An embodiment of the invention is shown in the accompanying drawings. Figure 1 shows a side elevation of the machine. Fig. 2 shows a longitudinal section of the upper portion of the machine. Fig. 3 shows a plan view of the machine with the machine table removed. Fig. 4 shows a plan view of a portion of the machine table. Fig. 5 shows a detail view of one of the stationary supports, and Figs. 6 and 7 show two bars bent by means of the machine.

The machine frame 1 is provided with a table 2. A shaft 3 is journaled vertically in the machine frame and the upper end 4 of said shaft projects above the machine table. Said end 4 of the shaft forms one of the stationary supports or stops for the bar or rod to be bent. Below the machine table 2 a disk 5 is secured to the shaft 3, said disk carrying a stud 6 which rojects through a curved slot 7 in the mac ine table. Said stud 6 forms the rotatable support pr stop for the bar or rod. The slot 7 in the machine table is covered by a disk or plate 8 provided with two holes and placed over the end 4 of the shaft and the stud 6. Outslde the periphery of said disk 8 a third support or stop for the rod or bar is secured to the machine table. Said support consists of the block 9 secured to the machine table, and the slide 10 which is fitted into the block and carries the roller 11 against which the bar or red is to bear. The position of the slide 10 and roller 11 may be adjusted by means 'of the screw 12 which is threaded into the block 9 and into the slide 10, as shown in Figs. 4 and 5. The roller 11 forms the second stationary support or stop for the bar or rod 13 to be bent in the machine.

As shown in Figs. 2 and 3, the disk 5 is provided at its periphery with a groove 14 into which is placed a rope 15, one end of sand rope being secured to the disk at 16 as indicated in Fig. 3. The rope 15 runs over a pulley 17 journaled in a slide block 18 movable on a screw 19 and guided by guides 20 under the machine table. The screw 19 is j ournaled in the machine frame, as shown in Fig. 3, and may be turned by means of the handle 21, so that the slide block 18 and the pulley 17 may be moved in the directionof said screw 19 transversely to the machine. A scale 22 is secured to and moves with the slide block 18 below an opening 23, Fig. 1, in the machine table, so that the movement of the slide block 18 and the pulley 17 caused by rotation of the handle 21 may be con trolled.

The other end of the rope 15 is secured to a crank pin 2 1 secured to a crank arm 25 on a shaft 26 to which rotary motion is imparted by means of a train of gears 27, 28, 29, 30, 31, 32, pulley 33 and belt 34: from a suitable motor 35.

The shaft 26 and crank arm 25 support a circular disk or plate 36 level with a bottom 37 in the machine frame for supporting the rope 15.

The vertical shaft 3 is also provided with a grooved disk 38 to which is secured one end of a rope 39 which is wound around said disk in the opposite direction to that of the rope 15 around the disk 14:. The other end of said rope 39 is attached to a spring 40 secured to the machine frame.

In the operation of the machine the bar or rod 13 to be bent is introduced between the supports 4, 6 and 11in such manner that the end 4 of the shaft is on one side of the bar and the stud 6 and roller 11 on the other side of the bar. Assuming that the crank pin 24 is continuously driven by the motor 35 in the direction indicated by the arrow in Fig. 3, and is in the position shown in Fig. 3, it will pull the rope 15 along, the rope running over the pulley 17 and causing the disk 14 and the shaft 3 to rotate in the direction indicated by the arrows in 3 and Fig. 4. The stud 6 on the disk 14- will thus rotate in the same direction around the axis of the shaft 3, and therbar 13 being supported by the end at or the shaft and against the roller .11 on the slide 10, said bar will thus be bent by the stud 6 around the end l of the shaft, as indicated in dotted and dashed lines in Fig. 4:. This bending of the bar continues until the crank 'pin or has reached its position farthest away from the pulley 17, when the pull of the crank pin 2aon the rope 15 ceases, so that the disk 14 may rotate in the reverse direction actuated by the rope 39 and the spring; 40. Said reverse rotation of the disk 1e will be stopped by the stud 6 striking against one end of the slot 7 in the machine table 2, when the disk 14; and stud 6 are in idle position and the bar 13 may be removed and another bar inserted. A scale 41, Fig. l, may be provided in the machine table for facilitating the proper insertion or" the bar.

It Will be understood that the angle of turning of the disk 14 is dependent upon the operative length 01"? the rope 15, or in other words upon whether the rope 15 is more or less stretched by means of the pulley 17, so that the crank pin begins to exert a pull on the rope 15 at an earlier or later stage after said pin has passed through its position nearest the pulley 17. The operative length of the rope 15 may be changed by adjustment of the pulley 1'? by means of the handle 21 and screw 19, and the adjustment may be read ed on the scale in the opening 23 in the machine table. By such adjustment it is thus possible to produce any desired bendingof the bar or rod, and the adjustment may be efiected while the machine is in operation.

As shown in Figs. 1 and 5, the stationary support formed by the block 9, slide 10, and roller 11 is higher than at least one or the two other supports, the end t of the shaft and the stud 6, in this case higher than both said supports, in order to prevent the bar 13, if it slides upward between the supports, from losing the engagement with the first named support, while it is still engaged by the end 4 of the shaft and the stud 6, in which case the entire bar might be swung around the end 4 of the shaft.

Fig. 6 illustrates ordinary bends on reinforcement bars for concrete constructions,

means oi the machine described above by ad usting the machine for only a very small ano'le oi? bendins z. and b i eedin the bar forward a quite small bending of the bar.

It will be understood that the invention is not limited to the embodiment above described and illustrated in the drawings, as various changes and modifications may be made in the same within the scope of the invention as expressed in the claims.

I claim:

1. In a machine for bending metal bars and the like, the combination of two stationary supports for the bar, a third rotatable support for said bar, a rotatable disk supporting said third support, a rope scoured to and wound around said disk, a ro- 'ary crank to which said rope is attached, and driving means for said crank.

2. In a machine for bonding metal bars and the like, the combination oil. two stationary supports for the bar, a third rotatable support for said bar, a rotatable disk supporting said third support, a rope secured to and wound around said disk, a roary crank to which said rope is attached, driving means For said crank, and means for adjusting the movement of said disk caused by said crank and said rope.

3. In a machine for bendingmetal bars and the like, the combination of two stationary supports for the bar, a third rotatable support for said bar, a rotatable disk supporting; said third support, a rope so cured to and wound around said disk, a ro tary crank to which said rope is attached, driv' 15 means for said crank, and means for cli'ectmg a COHtiDHOllS adjustment of the movement oi. said disk caused by "aid crank and said robe.

in wine for bonding metal bars and the J the con'ibiuation ol two stationary supports for the bar, a third rotutable support for said bar, a rotatable disk supportine said third support, a rope scoured to and wound around said disk, :1 rot crank to which aid rope is attached,

loans for said crank, and means for distance after every V111. adjusting the operative length elf said rope.

5. In a machine for bending metal bars and the like, the combination oi two stationary supports for the bar, a third rotutable support for said bar, a rotatable disk supporting said third support, a rope scoured to and wound around said disk. :1 rot: crank to which said rope is attached, d n means for said crank, and a pulley for said rope adjustable so as to stretch said rope more or less.

cusmv MAGNUS RUNBKCK.

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